Publications

These analyses evaluate the cost-effectiveness of the prescriptive path of the 2018 edition of the International Energy Conservation Code (IECC), relative to the 2015 IECC with amendments for all 50 states and the District of Columbia. The analysis covers one- and two-family dwelling units, townhouses, and low-rise multifamily residential buildings covered by the residential provisions of the 2018 IECC.

These analyses evaluate the cost-effectiveness of the prescriptive path of the 2018 edition of the International Energy Conservation Code (IECC), relative to the 2015 IECC with amendments for all 50 states and the District of Columbia. The analysis covers one- and two-family dwelling units, townhouses, and low-rise multifamily residential buildings covered by the residential provisions of the 2018 IECC.

These analyses evaluate the cost-effectiveness of the prescriptive path of the 2018 edition of the International Energy Conservation Code (IECC), relative to the 2015 IECC with amendments for all 50 states and the District of Columbia. The analysis covers one- and two-family dwelling units, townhouses, and low-rise multifamily residential buildings covered by the residential provisions of the 2018 IECC.

These analyses evaluate the cost-effectiveness of the prescriptive path of the 2018 edition of the International Energy Conservation Code (IECC), relative to the 2015 IECC with amendments for all 50 states and the District of Columbia. The analysis covers one- and two-family dwelling units, townhouses, and low-rise multifamily residential buildings covered by the residential provisions of the 2018 IECC.

These analyses evaluate the cost-effectiveness of the prescriptive path of the 2018 edition of the International Energy Conservation Code (IECC), relative to the 2015 IECC with amendments for all 50 states and the District of Columbia. The analysis covers one- and two-family dwelling units, townhouses, and low-rise multifamily residential buildings covered by the residential provisions of the 2018 IECC.

These analyses evaluate the cost-effectiveness of the prescriptive path of the 2018 edition of the International Energy Conservation Code (IECC), relative to the 2015 IECC with amendments for all 50 states and the District of Columbia. The analysis covers one- and two-family dwelling units, townhouses, and low-rise multifamily residential buildings covered by the residential provisions of the 2018 IECC.

These analyses evaluate the cost-effectiveness of the prescriptive path of the 2018 edition of the International Energy Conservation Code (IECC), relative to the 2015 IECC with amendments for all 50 states and the District of Columbia. The analysis covers one- and two-family dwelling units, townhouses, and low-rise multifamily residential buildings covered by the residential provisions of the 2018 IECC.

These analyses evaluate the cost-effectiveness of the prescriptive path of the 2018 edition of the International Energy Conservation Code (IECC), relative to the 2015 IECC with amendments for all 50 states and the District of Columbia. The analysis covers one- and two-family dwelling units, townhouses, and low-rise multifamily residential buildings covered by the residential provisions of the 2018 IECC.

This spreadsheet contains detailed end-use data results from the Determination Analysis of IECC-Residential 2024 conducted by Pacific Northwest National Laboratory.

Project Goal: Assess and record energy code compliance of buildings currently under construction, following the U.S. Department of Energy (DOE) processes, in compliance with the American Recovery and Reinvestment Act of 2009 (ARRA), and identify procedural changes in code enforcement and training needed to improve compliance rates.

Described separately from the U.S. DOE Multifamily Residential Energy Efficiency Field Study, this report is a simultaneous study of building air tightness occurred using several of the main study buildings and additional sites that met the building type criteria. Overall, 26 sites were evaluated this way using semi-automated testing equipment (blower doors).
 

From August 1997 to September 1999, one hundred new Arkansas homes were evaluated in two areas in the state where there was significant building activity in order to determine the energy performance of current building practices. One of the positive findings was that homes are now being built significantly tighter than a few years ago. Homes built in the early to in.id 1990's were experiencing an average of 0.5 natural air changes per hour (NACH), an acceptable level considered normal for new construction Only 24 homes in this evaluation had leakage rates exceeding 0.4 NACH; the majority of homes (58 percent) had leakage rates of 0.35 and under.

Technical analysis in support of the 2018 IECC Determination.

The most recent edition, the 2018 IECC, was published in August 2017, triggering the DOE review and determination process. In response, DOE and Pacific Northwest National Laboratory (PNNL) conducted a technical analysis to determine energy savings for the 2018 IECC residential provisions relative to the previous edition—the 2015 IECC. This report documents the methodology used to conduct the analysis and summarizes the results and findings.

The most recent edition, the 2021 IECC, was published on January 29, 2021, triggering the DOE review and determination process. DOE and Pacific Northwest National Laboratory (PNNL) conducted a technical analysis to determine energy savings for the 2021 IECC residential provisions relative to the previous edition, the 2018 IECC (ICC 2017). This report documents the methodology used to conduct the analysis and summarizes the results.

Section 304(a) of the Energy Conservation and Production Act, as amended, directs the U.S. Secretary of Energy to review the International Energy Conservation Code (IECC)1 and make a determination as to whether updated editions would improve energy efficiency in residential buildings. The IECC is developed by the International Code Council (ICC) through an established industry review and consensus process with updated editions typically published every 3 years. The U.S. Department of Energy (DOE) reviews the energy saving impacts of updated code editions and publishes its findings in the Federal Register. The DOE determination and accompanying technical analysis serve as useful guidance to state and local governments as they review and update their building codes. 

The most recent edition, the 2024 IECC, was published in August 2024, triggering the DOE review and determination process.2 DOE and Pacific Northwest National Laboratory (PNNL) conducted a technical analysis to determine energy savings for the 2024 IECC (ICC 2024) residential provisions relative to the previous edition, the 2021 IECC (ICC 2021). This report documents the methodology used to conduct the analysis and summarizes the results. 

EnergyPlus TMY3 weather file for climate location associated with the Manufactured Housing Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the Manufactured Housing Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the Manufactured Housing Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the Manufactured Housing Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the IECC Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the IECC Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the IECC Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the IECC Prototype Building Models.